Punch Cards Spools of Wire Magnetized Cardboard Photosensitive Film Clear plastic disks Audio Cassettes VHS Cassettes encased 1/2 size CDR's ...Fluidic Logic Gates . . . . I think this thread mainly illustrates (with great examples, THANKS) the difference between what's feasible and what's marketable. Let's face it, a good engineer can get anything to do anything else but when its' considered a success is when a million or more people can do it with a single push of a button. (And for less than a weeks salary). John A. (check out the price of those VidLP's Yike)